Auto Hubs not engaging (manual engage works fine)

Discussion in '6.0L PowerStroke Engine & Drivetrain' started by Metalhead, Sep 11, 2009.

  1. Metalhead

    Metalhead Full Access Member

    Messages:
    63
    Likes Received:
    0
    Joined:
    Aug 21, 2009
    Location:
    Round Rock, TX
    My auto hubs are not locking automatically anymore. About two weeks ago, I had run the truck in 4hi and noticed some clunking sounds coming from the hubs after I went back to 2wd. Since then, with the truck parked and idling, I can shift into 4hi and can feel that the driveshaft is engaged, but I can hand spin the axle shafts, meaning the hubs are not locking. I can manually lock the hubs however.

    What do you think this clunking sound was that I was hearing? At the time, I had thought it was maybe torque-bind. I reversed a few feet, then didn't have the sound anymore. Ever since then, the hubs don't auto lock anymore.
     
  2. DaveBen

    DaveBen SDD Senior Member

    Age:
    71
    Messages:
    9,586
    Likes Received:
    75
    Joined:
    May 31, 2005
    Location:
    Ukiah, California
    You have a vacuum leak. Check the hoses going to the back of the steering knuckle for leaks/cracks. 99% of the time one of the hoses is shot. Simple vacuum hose.

    Dave
     
  3. ckamp52

    ckamp52 ckamp52

    Messages:
    514
    Likes Received:
    0
    Joined:
    May 6, 2005
    Location:
    italy,tx and stephenville
    hope you're that lucky ..i always read that on here so when mine quit working i just knew i had it figured out but nah my whole pump was out
     
  4. strokepower

    strokepower Stroke=Power

    Messages:
    844
    Likes Received:
    0
    Joined:
    Jan 14, 2007
    Location:
    Cook Station, Mo
    this is typical on the 6.0s.. my 03 did and now my 05...
     
  5. Metalhead

    Metalhead Full Access Member

    Messages:
    63
    Likes Received:
    0
    Joined:
    Aug 21, 2009
    Location:
    Round Rock, TX
    I think the vacuum pump is fine, I can toggle between the dash vent, floor, defrost, and so on and the system responds quickly. It's raining out today, and I can't fit into the garage with this truck, so I'll check this over tomorrow. Thanks for the advice.
     
  6. ckamp52

    ckamp52 ckamp52

    Messages:
    514
    Likes Received:
    0
    Joined:
    May 6, 2005
    Location:
    italy,tx and stephenville
    oh yeah ur pump is fine then mine would do that or go in 4x4
     
  7. MONSTERPLOW

    MONSTERPLOW Cloud Booster 500HP

    Messages:
    239
    Likes Received:
    0
    Joined:
    Mar 17, 2008
    Location:
    I 95n.b. 1/10 Keystone State
    I always swore by "manual" (XL package )all my life .....no problems :tounge:clap:
     
  8. DR.Diesel

    DR.Diesel Full Access Member

    Messages:
    57
    Likes Received:
    0
    Joined:
    May 28, 2009
    Location:
    marlow ok
    stick a vacume gauge on the line going to your hubs.if no vaccume then the vaccume solinoid is bad.
     
  9. RandyH

    RandyH Full Access Member

    Messages:
    262
    Likes Received:
    5
    Joined:
    Feb 24, 2008
    Location:
    Western Colorado
    X 2

    When mine went, it was the solenoid.
     
  10. dennisj2003

    dennisj2003 Full Access Member

    Messages:
    144
    Likes Received:
    0
    Joined:
    Jan 9, 2008
    Location:
    Lizemores/WV
    Dont know how you drive, or if you use 4 wheel drive to really do some heavy work, but myself and several others here have had to replace several hubs that have busted, the hubs are simple to check, NAPA has the warn hubs for $125, but you wont have the auto feature.
    The hub when you take it off, shake the center from side to side to see how much play is there, shouldnt be more then 1/6 inch most, if more that could be the problem, its not busted but worn bad.
     

Share This Page